The Knowledge Representation and Reasoning (KR&R) conferences are the leading forum for timely, in-depth presentation of progress in the theory and principles underlying the representation and computational manipulation of knowledge. The papers in this volume have passed a stringent review process and cover a wide range of topics, including representation formalisms, reasoning techniques, implemented KR&R systems, cognitive robotics, agents and multiagent systems, planning, argumentation and preferences, KR&R logics, logic programming and answer-set programming, description logic and ontologies, and belief revision. These proceedings are an essential reference volume for researchers and students interested in the state-of-the-art of this key research area.